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pj
f0726a1e61
stepTimes threw the censoring flag away and handed the rank-sum a plain number per run, so a run the wall clock stopped at step 12 was ranked as one that violated at step 12. That was defensible while every clean run sat at the budget, the largest value any run could take, and it stopped being defensible when a clean run started being censored where it stopped. Twenty runs clean at step 12 against twenty violations at step 100 read a12 0.000 and p 4.683e-10 from the rank-sum, in the same report as a log-rank reading p 1.0000. The pairwise comparison is now the Gehan test over the observations themselves, and the report says how many run pairs censoring left with no order between them, which is how much of the effect size is the null value rather than an observation.
sanderling
Autonomous property-based testing for mobile and web apps.
You write rules that must always hold about your app. sanderling explores the app on its own for minutes or hours, performing thousands of taps, swipes, and inputs, and records every step where a rule breaks. No scripted test paths. One TypeScript spec runs against Android, iOS, and web builds of the same app.
import { extract, always } from "@sanderling/spec";
import { defaultActions } from "@sanderling/spec/defaults";
import { noUncaughtExceptions } from "@sanderling/spec/defaults/properties";
const balance = extract("balance", s =>
parseInt(s.ax.find({ testTag: "Balance" })?.text ?? "0", 10));
export const properties = {
noUncaughtExceptions,
balanceNeverNegative: always(() => balance.current >= 0),
};
export const actionsRoot = defaultActions;
Every run produces a trace: one JSON line and one screenshot per step. sanderling replay opens it in a web UI for stepping through actions, screenshots, property timelines, and violations.
Alpha. Android, iOS, and web (Chrome driver only). Full scope in the v0.1.0 roadmap.
Docs
- Introduction: what property-based testing is and how sanderling works
- Case study: Folio: sanderling finding a real bug in a mobile app
- Getting started: install the CLI and run it against Folio
- Spec language reference
- Examples: folio (KMP, Android/iOS/web), folio-web (React + Vite)
- Architecture for contributors
sanderling, a wading bird that probes the shoreline for bugs that lie beneath.